It is feasible with Sleipnir but the cable has to be of very high quality to transmit the data. With the Vaavud wind meter Mjolnir this is not possible.
Yes, your measurements will then be uploaded when you regain Internet connectivity.
We do not have an SDK for the wind meters yet.
Your wind measurements will automatically upload to a “Map”. There they are accessible by other users of the app and are anonymous.